When scientists raise newly hatched birds that have lost their parents, the scientists often use puppet-like devices to feed and care for the young birds. these puppet-like devices look like adult birds of the same species as the newly hatched birds. why do the scientists use these puppet-like devices?

so that way the bird will know how to raise its own egg and will be abel to safely reproduce

Explanation:

1. (1.2kw)x(15/60hours) = .3kwh --> a

2. (5kw)x(90/60hours)x(8cents/kwh) = $0.60 --> d

3. microwave --> 1200 watts = (1.2kw)x(6/60hours) = .12kwh

coffee-maker --> 900 watts = (.9kw)x(10/60hours) = .15kwh

therefore, it requires more energy for the coffee-maker to do the same amount of work.

so the answer is a.